I called an AC repair company to recharge the Freon. They told me that there was no Freon at all, so they needed to recharge it and put a dye to detect the leak. Then, they would come back later to locate the leak. I paid $650 (I live in Miami). I had cold AC for 6 days only. The tech came back, he said he spent 40 minutes on the roof and couldn't detect the leak, so they advised me to buy a new AC system. I asked the tech "what if the leak is somewhere between the roof and my condo? a new system would not fix the problem". Later, I received a quote for a new system for $5640. It includes a discount of the $650 I paid. If I don't buy from them, they would refund me 50% of the $650. I then asked the same question I asked to the tech. This is the response I got: "I spoke to the contractor and he advise me to let you know, we will pressure test all the lines while doing the installation at no charge so we can make sure no leaks happen with the new system.". My AC system is Goodman AW24-05C. Do you think that the AC repair company is honest or no?

I would like to install a wall mounted A/C unit in my master bedroom but the space where I would like to install it would need a casement style unit (taller than wide). Is this recommended? I don't see any of these taller-than-wide units listed as "wall" units.